Uninflammable liquids adapted for use in insulating and other similar purposes.



G EORGES LEPINE, F NEUCHA'I'EL, SWITZERLAND.

onmrnnmmasnn mourns anarrnn FOR USE IN'INSULATING AND OTB EB SIMILARPURPOSES.

Specification of Letters Paten Patented Feb. 5,1918.

. No Drawing. Origihaljapplioation filed April 18, 1914, Serial No.881,818. Divided and this application filed June 29, 1917.

To all whom it may concern:

Be it known that I, GEORGES Inirmn,

chemist, a citizen of the Republic of France,

residing at Neuchatel, Canton of Neuchatel, inthe Confederation ofSwitzerland, have invented certain new and useful Im rovements inUninflammable Liquids A apted for Use in Insulating and other SimilarPurposes, of which the following is a specification.

This invention relates to an uninflamma-' mable but which when heated tothis or a 1 higher temperature becomes inflammable again because theuninfiammable ingredients have evaporated therefrom, and on the con-'tra the present invention relates to a liquid which is uninflammable inall its ingredients 1 and forms an excellent substitute r theinflammable oil usually employed as an insulator in" electricalapparatus.

' chlorin compou This liquid made in accordance with the presentinvention conslsts preferably of pentachloret hane mixed with one ormore nds of hydrocarbons of the benzene senes, such for exam le astrichlorobenzen'e, GgH Cl pentach orobenzene 4 For example, a mixture ofthis compound C HCl and hexachlorobenzene 0 01,.

may consist in a 80 parts pentachlorethane 18 parts pentachlor'obenzene2 parts exachlorobenzene'with the addition of 1 part toluidin.

. comprising a mixture Serial No. 177,819.

This mixture is made as follows:

The pentachlorobenzene and the hexachlorobenzene are dissolved in thepentachlorethane and 1 per cent. toluidin isadded 1n order to fix thebodies which owing to decomposition wouldbe injurious to metals andwould then become electric conductors, OWlIlg to the said decomposition.

By the characteristic odorof the vapors produced from this mixture, whenheated, there is the advantage of indicating for example a probableperturbation of the elec trical apparatus in which the liquid isemployed as an insulator in substitution of the ordinary oil. Thismixture when gradually,

heated in an open crucible until vapors evolve does not take fire evenwhen the flame is directed into the vapor, but on the contrary thesevapors extinguish the flame. Tests have been made for determining thedielectric properties of this mixture and these show the followingresults:

The electric puncture test has been made between two points immersed inthe liquid at 18 C. The spark distance between the two points variedfrom 2.5 to 10 mm. and the tension was gradually raised until the firstspark occurred. The tension was supplied by a transformer of 20 k. w. of100000 volts at cycles per second.

The following are some values of tensions at which the first sparkoccurred:

I claim as my invention: c 1. An uninflammable and insulating liquid ofpentachlorethane and a chlorin compound of the hydrocarbons of thebenzene series together w1th the addition of a material to prevent thedecomposition of the liquid.

2.. An uninfiammable'ztnd insulating liquid 18 parts pentachlorobenzene'cemprising a mixture of pentichlorethane, 2 arts hexachlorobenzene withthe ad pentachlorobenzene and toluidin. dition of one part toluidin.

3. An uninflammable and insulating liquid. In testimony whereof I haveaffixed my 5 comprising a mixture of pentachlorethane, signature inpresence of two witnesses.

pentachlorobenzene, hexachlorobenzene and toluidin. I I GEORGES LEPINE.

' 4. An uninflammable and insulating liquid Witnesses: comprising amixture of A. J. LIERNUR,

10; 80 parts pentachlorethane Ron. 1m WURSTEMBERG.

